// Copyright 2004-2010 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 2.1 */

namespace NVelocity.Runtime.Parser
{
	using System;
	using System.Text;

	public class TokenMgrError : ApplicationException
	{
		/*
	* Ordinals for various reasons why an Error of this type can be thrown.
	*/

		/// <summary> Lexical error occurred.
		/// </summary>
		internal const int LEXICAL_ERROR = 0;

		/// <summary> An attempt was made to create a second instance of a static token manager.
		/// </summary>
		internal const int STATIC_LEXER_ERROR = 1;

		/// <summary> Tried to change to an invalid lexical state.
		/// </summary>
		internal const int INVALID_LEXICAL_STATE = 2;

		/// <summary> Detected (and bailed out of) an infinite loop in the token manager.
		/// </summary>
		internal const int LOOP_DETECTED = 3;

		/// <summary> Indicates the reason why the exception is thrown. It will have
		/// one of the above 4 values.
		/// </summary>
		internal int errorCode;

		/// <summary> Replaces unprintable characters by their escaped (or unicode escaped)
		/// equivalents in the given string
		/// </summary>
		protected internal static String AddEscapes(String str)
		{
			StringBuilder retval = new StringBuilder();
			char ch;
			for(int i = 0; i < str.Length; i++)
			{
				switch(str[i])
				{
					case (char) (0):
						continue;

					case '\b':
						retval.Append("\\b");
						continue;

					case '\t':
						retval.Append("\\t");
						continue;

					case '\n':
						retval.Append("\\n");
						continue;

					case '\f':
						retval.Append("\\f");
						continue;

					case '\r':
						retval.Append("\\r");
						continue;

					case '\"':
						retval.Append("\\\"");
						continue;

					case '\'':
						retval.Append("\\\'");
						continue;

					case '\\':
						retval.Append("\\\\");
						continue;

					default:
						if ((ch = str[i]) < 0x20 || ch > 0x7e)
						{
							String s = string.Format("0000{0}", Convert.ToString(ch, 16));
							retval.AppendFormat("\\u{0}", s.Substring(s.Length - 4, (s.Length) - (s.Length - 4)));
						}
						else
						{
							retval.Append(ch);
						}
						continue;
				}
			}
			return retval.ToString();
		}

		/// <summary> Returns a detailed message for the Error when it is thrown by the
		/// token manager to indicate a lexical error.
		/// Parameters :
		/// EOFSeen     : indicates if EOF caused the lexical error
		/// curLexState : lexical state in which this error occurred
		/// errorLine   : line number when the error occurred
		/// errorColumn : column number when the error occurred
		/// errorAfter  : prefix that was seen before this error occurred
		/// currentCharacter     : the offending character
		/// Note: You can customize the lexical error message by modifying this method.
		/// </summary>
		private static string LexicalError(bool EOFSeen, int errorLine, int errorColumn, string errorAfter,
		                                   char currentCharacter)
		{
			return
				(string.Format("Lexical error at line {0}, column {1}.  Encountered: {2}after : \"{3}\"", errorLine, errorColumn,
				               (EOFSeen
				                	? "<EOF> "
				                	: string.Format("{0} ({1}), ", (string.Format("\"{0}\"", AddEscapes(currentCharacter.ToString()))),
				                	                (int) currentCharacter)), AddEscapes(errorAfter)));
		}

		/// <summary> You can also modify the body of this method to customize your error messages.
		/// For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
		/// of end-users concern, so you can return something like :
		/// *
		/// "Internal Error : Please file a bug report .... "
		/// *
		/// from this method for such cases in the release version of your parser.
		/// </summary>
		/*
	* Constructors of various flavors follow.
	*/
		public TokenMgrError()
		{
		}

		public TokenMgrError(String message, int reason) : base(message)
		{
			errorCode = reason;
		}

		public TokenMgrError(bool EOFSeen, int errorLine, int errorColumn, string errorAfter, char curChar, int reason)
			: this(LexicalError(EOFSeen, errorLine, errorColumn, errorAfter, curChar), reason)
		{
		}
	}
}